NE556DT Datasheet, PDF (1/16 Pages) STMicroelectronics – General-purpose dual bipolar timers

NE556
SA556 - SE556
General-purpose dual bipolar timers
Features
■ Low turn-off time
■ Maximum operating frequency greater than
500 kHz
■ Timing from microseconds to hours
■ Operates in both astable and monostable
modes
■ Output can source or sink up to 200 mA
■ Adjustable duty cycle
■ TTL compatible
■ Temperature stability of 0.005% per °C
Description
The NE556, SA556 and SE556 dual monolithic
timing circuits are highly stable controllers
capable of producing accurate time delays or
oscillation. In the time delay mode of operation,
the time is precisely controlled by one external
resistor and capacitor. For a stable operation as
an oscillator, the free running frequency and the
duty cycle are both accurately controlled with two
external resistors and one capacitor.
The circuits may be triggered and reset on falling
waveforms, and the output structure can source
or sink up to 200 mA.
N
DIP14
(Plastic package)
D
SO14
(Plastic micropackage)
Pin connections
(top view)
Discharge 1
Threshold 2
Control Voltage 3
Reset 4
Output 5
Trigger 6
GND 7
14 VCC
13 Discharge
12 Threshold
11 Control Voltage
10 Reset
9 Output
8 Trigger
January 2009
Rev 2
1/16
www.st.com
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